Slant six help needed!

Slant sixes are cold natured, in part due to the long intake runners. You may want to check the automatic choke coil and the damper on the exhaust manifold.

The choke needs to engage when the gas pedal is pressed firmly to the floor and released before turning the key to start. It needs to disengage when the engine gets warm. If the engine idles faster than it should when warm, chances are the choke is stuck. A quick prod of the gas pedal should disengage it.

The damper on the exhaust manifold is a flapper valve controlled by a metallic spring outside of the manifold. The shaft typically will corrode and eventually stick either closed, or in your car's case, perhaps, open. PB Blaster or KROIL applied to the shaft will help loosen it.

As always, check for vacuum leaks.